<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<link rel="stylesheet" href="./index.css" type="text/css">
	<title>css动画</title>
</head>
<body>
	<div>
		<div></div>
	</div>
</body>
</html>
<script src="./index.js"></script>